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The world's best gem articles, published weekly.

Most Recent Articles

How to Measure Gem Girdle Thickness

Cutting the right size girdle for a gem can be difficult. Learn how girdles and jewelry settings affect each other and how best to measure girdle thickness.

Turkish Purple Jade Jewelry

What is Turkish purple jade? Learn about the qualities of this rare, beautiful, and versatile gemstone and see it transformed from rock to finished jewelry.

Dolomite Value, Price, and Jewelry Information

Although transparent dolomite crystals are fairly abundant and popular collector’s items, faceted gems are soft, fragile, and rarely seen in jewelry. However, massive material can be carved into decorative pieces.

Gems in Cufflinks

Wearing gems in cufflinks is a great way to add personality and style to an otherwise standard tuxedo. Read about ways to incorporate gems in cufflinks.

What Faceted Stone Sizes Will Sell Best?

How can a custom gem faceter compete with commercial cutting houses? Learn how cut stone sizes, gem quality, and expert cutting can make a difference.

Demantoid Garnet Buying Guide

Stunning green hues and a brilliance that outshines diamond combine to make demantoids truly captivating. Read more in our demantoid garnet buying guide.

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"Becoming a Pro Member of IGS just made good sense for my business. The gemology resources are fantastic, and my profile lets potential customers know I am serious about colored gemstones. And frankly, if I get any exposure to potential customers it's a no-brainer."
Paul Bierker, Paul Michael Designs
Jeweler, IGS Pro Member

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Over 15 years, we have assembled detailed pricing and value information for appraising over 70 different gemstones. The values in our guide come from a variety of sources including primary and secondary gemstone dealers, jewelers, miners, and wholesale suppliers of commonly traded gemstones.

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